37.2.2 GPIO Output Characteristics Figure 37-21. I/O Pin Output Voltage vs. Sink Current (VDD = 1.8V) Figure 37-22. I/O Pin Output Voltage vs. Sink Current (VDD = 3.0V) Figure 37-23. I/O Pin Output Voltage vs. Sink Current (VDD = 5.0V) Figure 37-24. I/O Pin Output Voltage vs. Sink Current (T = 25°C) Figure 37-25. I/O Pin Output Voltage vs. Source Current (VDD = 1.8V) Figure 37-26. I/O Pin Output Voltage vs. Source Current (VDD = 3.0V) Figure 37-27. I/O Pin Output Voltage vs. Source Current (VDD = 5.0V) Figure 37-28. I/O Pin Output Voltage vs. Source Current (T = 25°C)